Reland "Use off-heap data for type feedback in PolymorphicInstanceCallInstr"

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index 03a3741b984141d01e465d7beaad632ef1e7a8ab..644e8b2e9d12f8b49d6835765cb11ef9061f1571 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -2856,8 +2856,12 @@ class CheckedSmiSlowPath : public SlowPathCode {
     }
     __ pushq(locs->in(0).reg());
     __ pushq(locs->in(1).reg());
+    const String& selector =
+        String::Handle(instruction_->call()->ic_data()->target_name());
+    const Array& argument_names =
+        Array::Handle(instruction_->call()->ic_data()->arguments_descriptor());
     compiler->EmitMegamorphicInstanceCall(
-        *instruction_->call()->ic_data(), instruction_->call()->ArgumentCount(),
+        selector, argument_names, instruction_->call()->ArgumentCount(),
         instruction_->call()->deopt_id(), instruction_->call()->token_pos(),
         locs, try_index_,
         /* slow_path_argument_count = */ 2);
@@ -3021,8 +3025,12 @@ class CheckedSmiComparisonSlowPath : public SlowPathCode {
     }
     __ pushq(locs->in(0).reg());
     __ pushq(locs->in(1).reg());
+    String& selector =
+        String::Handle(instruction_->call()->ic_data()->target_name());
+    Array& argument_names =
+        Array::Handle(instruction_->call()->ic_data()->arguments_descriptor());
     compiler->EmitMegamorphicInstanceCall(
-        *instruction_->call()->ic_data(), instruction_->call()->ArgumentCount(),
+        selector, argument_names, instruction_->call()->ArgumentCount(),
         instruction_->call()->deopt_id(), instruction_->call()->token_pos(),
         locs, try_index_,
         /* slow_path_argument_count = */ 2);